The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 13, 2001
Filed:
Jan. 18, 2000
Shiro Nakagawa, Tokyo, JP;
Kazuyuki Itoh, Tokyo, JP;
Yoshihisa Okita, Tokyo, JP;
Katsumi Yabusaki, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
It is an object of the invention to provide a magnetic sensor and a current sensor that exhibit high performance at low costs. A magnetic sensor has a magnetic core (,) having a magnetic saturation property and a sensor coil (,) wound around the magnetic core (,). An end of a detection coil (,) is connected to an end of the sensor coil (,). The other end of the detection coil (,) is grounded. The magnetic sensor further comprises a drive circuit (,) and a detection circuit (,). The drive circuit (,) has a series resonance circuit part of which is made up of the sensor coil (,). To the sensor coil (,) the drive circuit (,) supplies a resonance current flowing into the series resonance circuit as an alternating current that allows the magnetic core (,) to reach a saturation region. The detection circuit (,) detects a magnetic field to be measured by detecting variations in resonance current flowing through the sensor coil (,).